• artificially colored blue agate - gemstone certificates

    Agate – Natural, Cabochon, Blue

    Can you rely on gemstone certificates to disclose whether stones have been treated or enhanced to improve their appearance or alter their colors? Artificially colored blue agate. Photo by Mauro Cateb. Licensed under CC By 2.0.

    Article: Gemstone Certificates

    Credit: Mauro Cateb

    GemstoneQuartz, Chalcedony, Agate
    Natural or man madeNatural
    Gem StateCabochon